Results 21 to 30 of about 41,422 (150)

A Differential Modulation Scheme for Metasurface-Based Terahertz Communications

open access: yesFrontiers in Communications and Networks, 2021
Metasurface-based terahertz (THz) modulators, which carry information by changing the spatial pattern of the metasurface at every symbol time, are an important component to establish low-cost low-energy–consuming THz communication systems.
Shuaishuai Guo, Jia Ye, Peng Zhang
doaj   +1 more source

Chiral Metasurface for Near-Field Imaging and Far-Field Holography Based on Deep Learning

open access: yesMicromachines, 2023
Chiral metasurfaces have great influence on the development of holography. Nonetheless, it is still challenging to design chiral metasurface structures on demand.
Yihang Qiu   +5 more
doaj   +1 more source

Real-Time Metasurface Sensor for Monitoring Micropoisons in Aqueous Solutions Based on Gold Nanoparticles and Terahertz Spectroscopy

open access: yesSensors, 2022
Proof of concept of a new real-time metasurface sensor for micropoison monitoring in aqueous solutions is proposed in this study. The sensor comprises a perfect absorber metasurface and gold nanoparticle layer on the front side of it.
Amir Abramovich   +2 more
doaj   +1 more source

Design of a wideband random phase gradient metasurface by using line-shaped element

open access: yesJournal of Advanced Dielectrics, 2020
Based on phase randomization theory, a method for manufacturing metasurface with diffuse scatter performance is proposed. By using the line-shaped elements with random rotate angles and random distributing positions, the metasurface can achieve good ...
Jiangniu Wu   +5 more
doaj   +1 more source

Metasurface-enabled on-chip multiplexed diffractive neural networks in the visible [PDF]

open access: yesLight: Science & Applications, 2021
Replacing electrons with photons is a compelling route toward high-speed, massively parallel, and low-power artificial intelligence computing. Recently, diffractive networks composed of phase surfaces were trained to perform machine learning tasks ...
Xuhao Luo   +8 more
semanticscholar   +1 more source

Controllable Manipulation of Wi-Fi Signals Using Tunable Metasurface

open access: yesLeida xuebao, 2021
In this paper, we propose the utilization of a programmable metasurface for flexibly manipulating ambient Wi-Fi signals. First, we propose a new and efficient optimization algorithm CWGS (Complex Weighted Gerchberg-Saxton), which is based on an ...
Ya SHUANG   +4 more
doaj   +1 more source

Optical secret sharing with cascaded metasurface holography [PDF]

open access: yesScience Advances, 2021
The secret of a holographic image can be shared across two closely stacked metasurface holograms. Secret sharing is a well-established cryptographic primitive for storing highly sensitive information like encryption keys for encoded data.
P. Georgi   +6 more
semanticscholar   +1 more source

Frequency coding metasurface for multiple directions manipulation of terahertz energy radiation

open access: yesAIP Advances, 2019
A multifunctional frequency coding metasurface is proposed in terahertz frequency band. Different from the previous coding metasurface with a fixed phase difference of the neighbor coding unit cells in the whole working frequency band, the proposed ...
Shao-He Li, Jiu-Sheng Li
doaj   +1 more source

Cascaded Channel Estimation for Large Intelligent Metasurface Assisted Massive MIMO [PDF]

open access: yesIEEE Wireless Communications Letters, 2019
In this letter, we consider the problem of channel estimation for large intelligent metasurface (LIM) assisted massive multiple-input multiple-output (MIMO) systems. The main challenge of this problem is that the LIM integrated with a large number of low-
Zhen-Qing He, Xiaojun Yuan
semanticscholar   +1 more source

A metasurface-based light-to-microwave transmitter for hybrid wireless communications

open access: yesLight: Science & Applications, 2022
Signal conversion plays an important role in many applications such as communication, sensing, and imaging. Realizing signal conversion between optical and microwave frequencies is a crucial step to construct hybrid communication systems that combine ...
X. Zhang   +8 more
semanticscholar   +1 more source

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